Bunsen burner,in particular for gas-heated once-through flow water heaters



United States Patent Georg Hein Huckeswagen;

' Gernot Rottmann, Solingen, Germany 818,484 Apr. 23, 1969 Dec. 29, 1970 Job. Vaillant KG. Remscheid, Germany July 10,1968 Germany No. 1,779,127

lnventors Appl. No. Filed Patented Assignee Priority BUNSEN BURNER, IN PARTICULAR FOR GAS- HEATED ONCE-THROUGH FLOW WATER HEATERS 7 Claims, 5 Drawing Figs.

US. Cl 239/557, 239/565, 239/568 Int. Cl B05 b 1/14 Field of Search 239/557, 566, 568, 548,556, 565

3,361,367 1/1968 Heinetal. 239/568X FORElGN PATENTS 1,037,232 9/1953 France 239/568 1,242,531 6/1967 Germany 239/557 Primary Examiner-M. Henson Wood, Jr. Assistant ExaminerMichael Y. Mar Attorney-Barbe, Robertson & Vandenburgh ABSTRACT: The gas-air mixture chamber of a burner is defined by two dished sides and an insert across the top, all being formed of sheet metal. The insert has vertical sides which rest on inwardly extending longitudinal beads of the sides. The tops of the sides are bent over above the insert to form flanges. The insert is crowned and has mixture discharge openings in staggered rows at each side of the crown. Adjacent the openings the flanges have indentations which bear on the insert. Between the indentations the flanges are spaced from the insert to define an internal space with a mixture discharge slit at the edge of the flange. The insert has openings between the chamber and the spaces between the flanges and the insert, intermediate the indentations.

PATENTED mm 3550.862

" SHEET 2 P 2 IN VEN TOR-3 1 Main 0 -BY -M BUNSEN BURNER, IN PARTICULAR FOR GAS-HEATED ONCE-THROUGH FLOW WATER HEATERS The invention relates to a bunsen burner, in particular for gas-heated once-through positive flow water heaters.

The prior art discloses bunsen burners having a burner body comprising two shaped sheet metal dishes which are closed at the top with an insert having transverse slits as gas exit openings (Federal German Pat. No. 1,242,531). The prior art alsodisclosed burners with transversely extending gas exit slits which are covered by attached longitudinal strips which cover the slit ends to form longitudinal chambers which facilitate transfer ignition even if the slit spacings are large (French Pat. Specification No. 1,037,232). A gas-air mixture is discharged from the longitudinal chambers at reduced flow velocity to form a stable flame edge which serves as retaining flame and prevents liftoff of the burner flames.

The object of the invention is to construct a bunsen burner of the kind heretofore mentioned so that a uniform flame edge is produced as retaining flame without the need for applying additional longitudinal strips, a procedure which does not present any manufacturing difficulties. It is important under these conditions to offer the least amount of obstruction to the supply of secondary air to the burner flames and to maintain a specified and constant flame pattern despite unavoidable manufacturing tolerances and in the event of thermal expansion.

To solve this problem according to the invention the upper edges of the sheet metal dishes areinwardly bent to form flanges which overlap the insert and-are spaced therefrom so that a longitudinal chamber is produced above the insert adjacent to the transverse slits and on each side thereof. Gas 7 under between the transverse slits. In order to maintain an ac-.

curate spacing between the flanges and the insert under manufacturing conditions, a further embodiment of the invention provides that the flangesof the sheet metal dished sides are each provided with an indentation adjacent to each transverse slit. Each indentation extends in an inwardly diminishing manner from the edge to the surface of the insert by means of which the longitudinal chambers are subdivided into individual intercommunicating sections extending from transverse slit to transverse slit. The distance, that is to say the exit slit of the longitudinal chambers, is determined by'the depth of the indentations. An additional advantage is obtained in that the exit gap or slit is appropriately interrupted so that no flame edge which might obstruct the supply of secondary air is disposed directly adjacent to the burner flames. A constant dimension of the longitudinal chamber exit gap interrupted by the indentations is maintained evenunder conditions of thermal expansion. I

The insert is appropriately formed in the shape of a shallow roof or crown and is provided with two rows of transverse slits offset relative to' each other by half the pitch. The secondary air can easily reach the offset burning flames. Owing to the roof shape. the two rows of flames are slightly inclined outwardly to ensure good transfer ignition to an adjacent bunsen I burner of the same construction.

Retention of the insert is facilitatedin that the insert has downwardly extending sides which bear on head rims which are embossed into the sheet metal dishes.

An embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which:

FIG. 1 shows a front elevation of part of a bunsen burner for gas water heaters, comprising a plurality of individual burners and being disposed on the right of the middle, vertical gas connecting pipe,

FIG. 2 is a plan view of the burner, partially in accordance with FIG. 1. 1

FIG. 3 shows to a larger scale than in FIGS. 1 and 2 a section through the upper part of an individual burner.

FIG. 4 is a plan view of an individual burner.

FIG. 5 shows a front elevation of the upper part of an individual burner.

- In FIGS. 1 and 2, the numeral 1 refers to a gas connecting pipe which is adapted to be connected in known manner to a gas control valve. Gas flows from said gas control valve via a branch pipe 2 to a distribution pipe 3 which is in T-connection with the branch pipe. Gas nozzles which. are not shown are horizontally mounted adjacent each other in the aforementioned distribution pipe, to blow the gas into the mixing chamber 4 of the individual burners 5, 6, 7, 8 while at the same time entrajning primary air. The burner units of the individual burner comprise'two heat-resistant dished members 55"66"7'7"8'8respectively which are formed from sheet metal (see FIG. 1). These define a chamber 9 which is closed at the top by an insert 10. The assembly of individual burners 5 to 8 is retained by a bar 11 (see FlG. 1-) which joins all in-v dividual burners and is mounted by means of screws 12 on the distribution pipe 3 which supports the'nozzles. The mixing chambers 4 are disposed coaxially relative to the gas noul'es.

After placing the insert between the two dished members 5', 5" for example, the upwardly extending edges of the mem bers 5'5" are inwardly bent to form flanges 13 which overlap the insert 10 and with the surface of the insert 10 define narrow gaps or slits l5. Indentations' 16, 16 are provided at intervals in the flanges 13 (see FIG. 4). Theseindentations have a certain depth and bear upon the insert 10. The flanges l3 cover openings or ports 17, 17' in the burner insert 10. A gasair mixture, obtained from the burner chamber 9, passesthrough the aforementioned openings into expansion chambers l4, 14'. i

As can be seen in FIG. 4, the openings .17, 17' are disposed at regular distances from each'other. Both rows are disposed offset relative to each otherin theinsert 10. At the same distance from the openings 17, l7-the insert has provided in it ,verse slits therefore tend to diverge to facilitate easy transfer ignition from one individual burner 5 to an adjacent individual burner 6 for example. The secondary air 'can pass without obstruction to all individual flames 1 9, 19' owing to the offset position and because of the presence of the indentations 16, 16'. A retaining flame 20 (20') burns from the slit 15 (15') between each two indentations 16,16 to produce an uninterrupted flame edge at the indentations.

The individual flames 19, 19 and the retaining flames 20, 20' are indicated in diagrammatic form in FIG. 5.

The bent edges in the zone of the ends of the insert 10 are bent downwardly at 10' (see FIG. 3) to the plane ends of the insert 10 so that these parts of the edges bear upon theinsert l0 and to sealingly retain it. Along the longitudinal sides the insert 10 has vertical sides 21,21 (see FIG. 3) which bear on beads 22, 22' of the-dished sides, for example, 5, 5'.

We claim:

1. In a gas burner body comprising two longitudinally straight and transversely dished sheet metal members defining the bottom and sides of a chamber for the gas and primary air mixture and 'a sheet metal insert between said members and forming the top of said chamber, said insert having mixture discharge openings therethrough which extend transversely to said members, the improvement comprising:

each of said members having a flange extending toward the other of the members, said flanges overlying said insert, between adjacent openings said flanges being spaced outwardly from said insert to define longitudinal mixturedischarge slits; and said body defining ports communicating between said chamber and said slits for the passage of the mixture to said slits.

2. In a gas burner body as set forth in claim 1, wherein at said openings said flanges have indentations extending in the direction of said insert and forming the relatively closed ends of adjacent slits; said ports being in said insert, between said openings and being covered by said flanges.

3. In a gas burner body as set forthin claim 2, wherein the insert is crowned with the outwardly extending portion of the crown being approximately along the longitudinal centerline of the insert, said openings comprising a first row at one side of said centerline and a second rowat the opposite side of said centerline,-the openings of one row being approximately midway between the openings of the other row, along each row the adjacent flange and insert forming one of said slits between each pair. of adjacent openings.

4. In a gas burner body as set forth in claim 3, wherein each member has an 'inwardlyextending longitudinal bead along the side thereof, said insert resting on said bead.

5. In a gas burner bodylas set forth in claim 1, wherein the insert is crowned with' the outwardly extending-portion of the crown being approximately along the longitudinal centerline':

of the insert, said openings comprising a first row atonegside of said centerline and a second row at the opposite side of said centerline, the openings at ohe.'row being approximately midway between the openings of the other ro'w, alofi'g each row the adjacent flange and 'ins'ert forming one -of said slits between each'pair of adjacent opehingss' 6. In a gas burner body as set 'forth'ihcl'aim SQWher'ein'each member has an inwardly extending longitudinal"bead along the side thereof, said insert resting pn'said bead."

7. In a gas burner body as set forth infclain'i l, wherein each member has an inwardly extending longitudinal bead along the side thereof, said insert restingon said head. 

